Indiana Caverns, home to Indiana’s longest cavern, dares visitors to descend into the Deep Darkness on a tour designed to give daredevils their daily dose of adrenaline. After heading more than 200 feet below the ground into the always-refreshing 52-degree environment, adventurers traverse one of the longest cave systems in the nation in an unforgettable exploration.

​To journey that far beneath the surface, travelers must be able to climb down a 91-foot ladder on a belay, which leads to an underground mountain. After descending the mountain, voyagers then cross a subterranean river, which deepens, requiring travelers to get into kayaks in order to continue their journey.